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{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
\paperw11900\paperh16840\margl1440\margr1440\vieww9000\viewh8400\viewkind0
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\f0\fs24 \cf0 y = m1 x + c1\
y = m2 x + c2\
\
m1x + c1 = m2x +c2\
m1x - m2x = c2-c1\
x(m1m2) = c2-c1\
x = c2-c1/m1-m2\
\
\
c where line crosses y axis\
y = c1/k1 x + c\
\
c = height\
k = x\
\
\
m = gradient = (x2-x1)/(y2-y1)}